两种常见番茄致病真菌对几种杀菌剂的敏感性测定

旨在筛选能同时有效抑制番茄早疫病菌和番茄晚疫病菌生长的杀菌剂。采用生长速率法测定了几种杀菌剂对供试病原菌的EC50值，并通过EC50值比较病原菌对供试杀菌剂的敏感性。结果表明：番茄早疫病菌对25%啶菌噁唑EC、25%咪鲜胺EC表现敏感，对50%腐霉利WP、0.3%丁子香酚SL和10%多抗霉素B WP表现中抗；番茄晚疫病菌仅对25%啶菌噁唑EC表现敏感，对25%咪鲜胺EC、0.3%丁子香酚SL和10%多抗霉素B WP表现中抗，对50%腐霉利WP则表现高抗。2种病原菌对2×108 cfu/g绿色木霉菌WP和8×109 cfu/mL枯草芽孢杆菌AS较为敏感，EC50值均小于1×108 cfu/L。化学杀菌剂中啶菌噁唑，生物源杀菌剂中丁子香酚、绿色木霉菌和枯草芽孢杆菌对2种番茄致病真菌的抑菌效果较好的药剂，用量少且毒性低，可以在生产中推广使用。

Detection of sensitivities of two common tomato pathogenic fungi to several fungicides

By determining EC50 values, the sensitivities of two tomato pathogenic fungi (Alternaria solani and Phytophthora infestans) to several fungicides were tested. The results showed that Alternaria solani were sensitive to 25% SYP-2048 EC and 25% prochloraz EC and intermediate resistant to 50% procymidone WP、0.3% eugenol SL and 10% polyoxin B WP；Phytophthora infestans were sensitive to 25% SYP-2048 EC only and intermediate resistant to 25% prochloraz EC、0.3% eugenol SL、10% polyoxin B WP and highly resistant to 50% procymidone WP; two pathogen fungi were both relatively sensitive to 2×108cfu/g Trichoderma viride WP and 8×109cfu/ml Bacillus subtilis AS, the EC50 values were less than 1×108cfu/L.